JP2023083866A - Connection joint - Google Patents

Abstract

To provide a connection joint with simple connection allowing rigid connection at a low cost because it is hard to be deformed as well as compact and easy to be processed.SOLUTION: A connection joint 3 is to connect segments 2 by relatively moving one joint fitting 3a and the other joint fitting 3b in one direction. Each of one joint fitting 3a and the other joint fitting 3b is provided with a plate-like member 31 fixed on the segment 2, a first hook part 32 provided at a tip side of the plate-like member 31, and a first hook receiving part 33 provided at a base end side of the plate-like member 31. The first hook part 32 has a pair of first protruded parts 320 protruding in one direction side of the plate-like member 31, and the first hook receiving part 33 has a pair of first groove parts 330 at a front surface side and a rear surface side of the plate-like member 31, to accomplish the connection by fitting and clamping the first protruded parts 320 in the first groove parts 330.SELECTED DRAWING: Figure 13

Description

TECHNICAL FIELD The present invention relates to a connection joint suitable for connecting segments in construction of a shield tunnel.

To connect the RC segments, the connecting surfaces of the two segments to be connected are butted together, and a connecting bolt passing through each connecting plate provided on both connecting surfaces and a nut screwed to the connecting bolt are used. It is common to connect by tightening both connecting plates.
However, such a connection structure by bolting has the following problems.
・It takes time to fasten bolts.
・Bolts tend to loosen during excavation and need to be retightened.
・Roundness decreases due to bolt hole clearance.
・Secondary lining or rust prevention treatment is required because the joint metal is exposed on the surface.
・In order to secure inner surface smoothness, it is necessary to fill the hole of the bolt box.
・Cannot be used for automatic assembly.

Further, in Patent Document 1, a substantially cylindrical female connector having a semicircular concave portion formed by notching the connecting surface of both segments to be connected and having a fitting hole in the concave portion of one of the segments. is attached in a semi-submerged state, and in the recess of the other segment, a substantially cylindrical male connector that can be fitted into the fitting hole of the female connector is attached in a semi-submerged state, and the segment is tunneled Disclosed is a segment connecting structure capable of connecting segments easily and in a short time by moving in the axial direction and inserting and fitting the male connector into the fitting hole of the female connector. Furthermore, in Patent Document 1, both the male connector and the female connector are formed in a truncated cone shape, and the male connector is fitted to the female connector by a wedging action. is described.

Japanese Patent No. 3010011

In the segment connection structure as described in Patent Document 1, it is necessary to fill the circular hole in which the male connector and the female connector are accommodated with grout. Since a cushioning material is provided on the outer periphery of the connector, the joint part is easily deformed. , it is difficult to secure the installation accuracy of the anchor portion when manufacturing the segment, and the cross-sectional shape of the anchor portion tends to be large.
For this reason, there are the following problems.
・Reduces deformation of the joint part ・Reduces cost by reducing the shape of the joint body and the reduction of processing steps ・Simplifies the connection between the joint body and the anchor member ・Reduces the fixing length of the anchor member

The problem to be solved by the present invention is to provide a connection joint and a segment connection method that are difficult to deform, compact, and easy to process, are inexpensive, can be firmly connected, and are easy to connect. be.

The invention according to claim 1 of the present application is a connecting joint that connects segments by relatively moving one joint fitting and another joint fitting in one direction, wherein the one joint fitting and the other joint fitting are connected to each other. means a plate-shaped member fixed to a segment, a first hook provided on the distal side of the plate-shaped member, and a first hook provided on the proximal side of the first hook of the plate-shaped member, respectively. a hook receiving portion, wherein the first hook portion has a pair of first projecting portions that protrude in one direction of the plate-shaped member, and the first hook receiving portion is located on the surface of the plate-shaped member. The connection joint is characterized in that it has a pair of first grooves on the side and the back side, and the first projection is fitted into and sandwiched between the first grooves for connection.

In the invention according to claim 2 of the present application, the first protrusion has a tapered shape in which the width gradually narrows toward the tip, and the first groove extends in a direction in which the first protrusion is fitted. 2. A coupling joint according to claim 1, characterized in that it is tapered with a width gradually narrowing towards the end.

The invention according to claim 3 of the present application is the connection joint according to claim 1 or claim 2, characterized in that the distance between the facing surfaces of the first projecting portion gradually widens toward the tip. .

In the invention according to claim 4 of the present application, the first hook receiving portion has a restricting portion protruding toward one side of the plate-like member from the first groove portion of the plate-like member toward the base end side, and the restricting portion The connecting joint according to any one of claims 1 to 3, wherein the first projection guides the first projection when the first projection fits into the first groove. be.

The invention according to claim 5 of the present application is characterized in that a reinforcing rib is formed on the plate member between the first hook portion and the first hook receiving portion. The connection joint according to any one of the above.

In the invention according to Claim 6 of the present application, the one joint fitting and the other joint fitting further each include a second hook portion provided on the base end side of the first hook portion of the plate-shaped member, a second hook receiving portion provided on the tip side of the first hook receiving portion of the plate-like member, wherein the second hook portion is a pair of second protrusions that protrude in one direction of the plate-like member; The second hook receiving part has a pair of second grooves on the front side and the back side of the plate-like member, and the second projecting part is fitted and sandwiched in the second groove part. A connection joint according to any one of claims 1 to 5, characterized in that it connects.

In the invention according to claim 7 of the present application, the second protrusion has a tapered shape in which the width gradually narrows toward the tip, and the second groove extends in a direction in which the second protrusion is fitted. 7. A coupling joint according to claim 6, characterized in that it is tapered with a gradually narrowing width.

The invention according to claim 8 of the present application is the connection joint according to claim 6 or 7, characterized in that the distance between the facing surfaces of the second projecting portion gradually widens toward the tip. .

In the invention according to claim 9 of the present application, the plate-like member includes attachment portions to which anchor portions protruding on both sides of the plate-like member in the tunnel axis direction are attached, and the plate-like member between the attachment portions 9. A connection joint according to any one of claims 1 to 8, characterized in that the thickness of the segment in the thickness direction is smaller than the thickness of the attachment portion.

The invention according to claim 10 of the present application is characterized in that the one fitting and the other fitting have the same shape, according to any one of claims 1 to 9. It is a connecting joint.

In the invention according to claim 11 of the present application, the plate-like member includes a mounting portion to which anchor portions protruding on both sides of the plate-like member in the tunnel axis direction are mounted, and an anchor portion to be mounted on the mounting portion, and the anchor 11. The coupling joint according to any one of claims 1 to 10, wherein the portion has a male screw portion, and the male screw portion is passed through the mounting portion and fastened with a nut. is.

The invention according to Claim 12 of the present application is the connection joint according to Claim 11, wherein the anchor portion has a U-shape having the male screw portions at both ends.

According to the present invention, the first protruding portion of the first hook portion sandwiches the front and back first groove portions to connect the joint fittings, and the connection between one joint fitting and the other fitting fitting is on the distal end side of the plate-shaped member. Since it is formed at two points on the base end side, it can be firmly connected, and deformation can also be strongly suppressed.

In addition, the first protrusion has a tapered shape with a width that gradually narrows toward the tip, and the first groove has a tapered shape with a width that gradually narrows in the direction in which the first protrusion is fitted. Therefore, it is easy to fit the first protrusion into the first groove.

In addition, since the distance between the facing surfaces of the first protrusion gradually widens toward the tip, it becomes easier to sandwich the plate-like member when connecting, and the first protrusion can be easily fitted into the first groove. .

In addition, the first hook receiving portion has a restricting portion protruding toward one side of the plate-like member on the base end side of the first groove portion of the plate-like member. Since the first projecting portion is guided during fitting, the first projecting portion of the first hook is smoothly fitted into the first groove.

In addition, since reinforcing ribs are formed on the plate-like member between the first hook portion and the first hook receiving portion, the strength of the plate-like member is increased, and the deformation suppressing function and shear resistance of the connecting joint are improved. do.

In addition, the second protruding portion of the second hook sandwiches the second grooves on the front and back to connect the joint fittings, and the connection between one joint fitting and the other joint fitting is at the distal end side and the proximal end of the plate-shaped member. Since it is formed at four locations on the sides, it can be firmly connected and deformation can be strongly suppressed.

In addition, the second protrusion has a tapered shape whose width gradually narrows toward the tip, and the second groove has a tapered shape whose width gradually narrows toward the direction in which the second protrusion is fitted. Therefore, it is easy to fit the second protrusion into the second groove.

In addition, since the distance between the facing surfaces of the second protrusion gradually widens toward the tip, it becomes easier to sandwich the plate-shaped member when connecting, and the second protrusion can be easily fitted into the second groove. .

In addition, the plate-like member has attachment portions to which the anchor portions projecting on both sides of the plate-like member in the tunnel axial direction are attached, and the thickness in the segment thickness direction of the plate-like member between the attachment portions is Since it is thinner than the mounting portion, the thickness of the plate member between the overhanging portions can be reduced, and the cost can be reduced.

In addition, one joint fitting and another joint fitting have the same shape, and are arranged and connected by reversing them, so that the number of processing steps when manufacturing the joint is reduced, and the cost is reduced. be able to.

In addition, the plate-shaped member includes a mounting portion to which the anchor portions projecting on both sides of the plate-shaped member in the tunnel axial direction are mounted, and an anchor portion mounted to the mounting portion, the anchor portion having a male screw portion, Since the male threaded portion penetrates the mounting portion and is fastened with a nut, there is no need to process a female thread on the fitting side, and the cost can be reduced.

In addition, since the anchor portion is U-shaped and has male screw portions at both ends, the number of parts can be reduced, and the fixing length can be reduced.

1 is a schematic diagram of a shield tunnel according to an embodiment of the invention; FIG. It is the inner surface view seen from the tunnel center side of the segment which concerns on embodiment of this invention. It is the side view seen from the tunnel axial direction of the segment which concerns on embodiment of this invention. FIG. 4 is an end view of a segment viewed from the tunnel circumferential direction according to an embodiment of the present invention; 4 is an enlarged internal view of a segment according to an embodiment of the invention; FIG. FIG. 4 is a cross-sectional view of a main part of a segment according to an embodiment of the invention; FIG. 4 is a vertical cross-sectional view of a segment according to an embodiment of the present invention; Fig. 8(a) is a plan view and Fig. 8(b) is an end view showing an anchor portion and a proximal end portion of a fitting according to an embodiment of the present invention; Fig. 9(a) is a plan view, Fig. 9(b) is a side view, and Fig. 9(c) is an end view showing a plate member of a fitting according to an embodiment of the present invention. FIG. 9A is a cross-sectional view taken along the line AA of FIG. 9A; FIG. 9B is a cross-sectional view taken along the line BB in FIG. 9A. FIG. 9(a) is a cross-sectional view taken along the line CC. It is a figure which shows the connection procedure of a connection joint.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, it cannot be overemphasized that this invention is not limited to embodiment.
The following description relates to an embodiment in which the present invention is applied to a connection joint that connects adjacent segments in the tunnel circumferential direction, a so-called piece-to-piece joint, in a shield tunnel.

1 is a schematic diagram of a shield tunnel according to an embodiment, FIG. 2 is an internal view of a segment according to an embodiment, FIG. 3 is a side view of the segment, FIG. 4 is an end view of the segment, and FIG. , an enlarged inner view of the segment, FIG. 6 is a cross-sectional view of the main part of the segment, FIG. 7 is a vertical cross-sectional view of the main part of the segment, FIG. 10 to 12 are cross-sectional views of each part of the plate-shaped member, and FIG. 13 is a diagram showing a connection procedure of the connection joint.

As shown in FIG. 1, in the shield tunnel 1, a segment ring 21 is formed by assembling the segments 2 inside the shield machine while excavating the ground with the shield machine starting from the portal.
The segment ring 21 is formed by sequentially connecting pieces of each segment 2 in the circumferential direction of the tunnel on the face side of the existing segment ring 21 .

As shown in FIGS. 2, 3 and 5, inter-ring joints 22 for connecting segment rings 21 are provided on both side surfaces of the segment 2 in the tunnel axial direction.
In this embodiment, the ring-to-ring joint 22 employs a so-called one-pass joint composed of a male fitting and a female fitting embedded in both side surfaces of the segment 2 .

As shown in FIGS. 2, 4 and 5, the connecting joints 3 that connect the segments 2 adjacent to each other in the tunnel circumferential direction are installed on the connecting surfaces 20 that are both end faces of the segments 2 in the tunnel circumferential direction. It consists of a single fitting 3a and another fitting 3b.
The connecting pieces 312 of the one fitting 3 a and the other fitting 3 b are provided in the concave portions 23 a and 23 b formed in the connecting surface 20 of the segment 2 .

As shown in FIGS. 6 and 7, the one fitting 3a and the other fitting 3b are respectively an anchor portion 30 embedded in the segment 2 and a part thereof embedded with the anchor portion 30 attached to form a concave portion. A plate-like member 31 that protrudes and is fixed from the connecting surface 20 of the segment 2 via 23a and 23b, a first hook portion 32 that is provided on the tip side of the plate-like member 31, and a first hook portion of the plate-like member 31. and a first hook receiving portion 33 provided on the proximal end side from 32 .

As shown in FIG. 8, the anchor part 30 is made of a U-shaped U-bolt having male threaded parts 300 at both ends. Embedded in segment 2.

The anchor part 30 is attached to an attachment piece 311 which is an attachment part projecting on both sides of the plate member 31 in the tunnel axial direction. The anchor portion 30 is attached to the plate-like member 31 by inserting the male screw portion 300 of the anchor portion 30 into the through hole provided in the attachment piece 311 and fastening it with the nut 301 .

Since the male screw portion 300 of the anchor portion 30 is passed through the mounting piece 311 and fastened with the nut 301, there is no need to process the female screw on the plate-like member 31 on the side of the fitting, thereby reducing the cost.
Since the anchor portion 30 is U-shaped, the number of parts can be reduced, and the fixing length can be reduced.

The plate member 31 includes a plate member parallel to a plane including the central axis of the axial rod of the anchor portion 30 (FIG. 6), and as shown in FIG. , and is provided with mounting pieces 311 projecting on both sides of the base end portion 310 in the tunnel axial direction. The mounting piece 311 has a substantially cylindrical shape and has a through hole inside, through which the male threaded portion 300 of the anchor portion 30 is inserted.

The thickness in the segment thickness direction of the base end portion 310 of the plate member 31 between the mounting pieces 311 on both sides is thinner than the thickness of the mounting pieces 311 (FIG. 9(c)). The mounting piece 311 to which the anchor portion 30 is attached needs to have a certain thickness, but by arranging the mounting pieces 311 on both sides of the base end portion 310 in this way, it becomes possible to reduce the thickness and reduce the cost. reduction can be achieved.

In addition, by projecting the mounting piece 311 , it is possible to secure a space for the male threaded portion 300 of the anchor portion 30 to pass through and protrude toward the distal end side for fastening with the nut 301 .

An inclined portion 310a whose thickness gradually decreases from the surface side and the back surface side is provided on the tip side of the base end portion 310 (FIGS. 6, 7, and 9). Since the inclined portion 310a is embedded in the segment 2, it enhances the anchor effect against the tensile force acting on the plate-like member 31 due to the connection of the joint fitting.

The plate-like member 31 is integrally formed with a connecting piece 312 extending in the circumferential direction of the segment 2 from the tip of the inclined portion 310a of the base end portion 310 and extending from one side portion of the base end portion 310 by approximately half the width.

As shown in FIGS. 9 and 10, the first hook 32 is provided on the front side and the back side of the tip of the connecting piece 312, respectively, and extends from the connecting piece 312 of the plate member in one direction (for connecting the segments). It has a pair of first protrusions 320 that protrude toward the (direction) side in which one joint fitting and the other joint fitting are moved relative to each other.

The first protruding portion 320 is continuously formed on the surface side and the back side of the connection piece 312 on the base end side from which the first protruding portion 320 of the first hook portion 32 protrudes, and the first hook bank portion 321 is formed. forming The first hook bank portion 321 is for forming the second groove portion 350 and also functions as a reinforcing portion (rib) of the connecting piece 312 . Since the first hook bank portion 321 is for forming the second groove portion 350, it is also the second hook receiving bank portion.

As shown in FIG. 9( a ), the length of the first projecting portion 320 is the same as the width of the base end portion 310 . Also, the shape of the first protruding portion 320 when viewed from the front and back directions is a tapered shape (both tapered) in which the width gradually narrows toward the tip.
As shown in FIG. 10 , a gap having approximately the same thickness as the connecting piece 312 is formed between the pair of first protrusions 320 . The distance between the facing surfaces of the pair of first protrusions 320 gradually widens toward the tips of the first protrusions 320 on the protruding side. Therefore, when connecting, the connecting piece 312 of the plate member 31 can be easily sandwiched, and the first projecting portion 320 can be easily fitted into the first groove portion 330 .

As shown in FIG. 9 , the first hook receiving portion 33 is provided on the base end side of the first hook portion 32 of the plate-like member 31 , and has a pair of hooks on the front side and the back side of the connecting piece 312 of the plate-like member 31 . It has a first groove portion 330 .
The first groove portion 330 includes a pair of bank portions (a second hook bank portion 331 and a restricting bank portion 332). The second hook bank portion 331 and the restricting bank portion 332 are for forming the first groove portion 330 and also function as reinforcing portions (ribs) of the connecting piece 312 . Since the second hook bank portion 321 and the restricting bank portion 332 are for forming the first groove portion 330, they also serve as the first hook receiving bank portion.

The first hook portion 32 and the first hook receiving portion 33 are connected by fitting and sandwiching the first protruding portion 320 into the first groove portion 330 formed by the second hook bank portion 331 and the restricting bank portion 332 . The first groove portion 330 has a tapered shape (both tapers) in which the width gradually narrows in the direction in which the first projecting portion 320 is fitted. Since the first projecting portion 320 and the first groove portion 330 are tapered, the first projecting portion 320 can be easily fitted into the first groove portion 330 .

As shown in FIGS. 9 and 11, the restricting bank portion 332 is formed on the surface side and the back surface side of the connecting piece 312, and includes the first hook receiving portion 33 continuously protruding from the restricting bank portion 332. A restricting portion 313 is formed. The restricting portion 313 has the same length as the first projecting portion 320 and has a tapered shape (single taper) in which the width gradually narrows in the direction in which the first projecting portion 320 is fitted.

The restricting portion 313 extends from the connecting piece 312 of the plate-like member 31 toward the base end side of the first groove portion 330 in the connecting piece 312 of the plate-like member 31 in one direction (one fitting and another fitting for connecting the segments). and guide the first projecting portion 320 when the first projecting portion 320 is fitted into the first groove portion 330, and the first projecting portion 320 is fitted into the first groove portion 330. smoother.

As shown in FIGS. 9 and 12 , the second hook bank portion 331 is formed on the front side and the back side of the connecting piece 312, and continuously protrudes from the second hook bank portion 331. 34 second protrusions 340 are formed.

The second hook portion 34 is located on the base end side of the first hook portion 32 of the connecting piece 312 of the plate-like member 31, and the second projecting portion 340 is located across the first groove portion 330 from the restricting portion 313. be provided.
As shown in FIG. 12 , the second hook portion 34 has a pair of second projecting portions 340 provided on the front side and the back side of the connecting piece 312 and projecting toward the other side of the plate-like member 31 . Between the pair of second protruding portions 340, a gap having approximately the same thickness as the connecting piece 312 is formed. The distance between the facing surfaces of the pair of second protrusions 340 gradually widens toward the tip of the second protrusions 340 . Therefore, when connecting, the connecting piece 312 of the plate member 31 can be easily sandwiched, and the second projecting portion 340 can be easily fitted into the second groove portion 350 .

The second projecting portion 340 has the same length as the first projecting portion 320, and the shape of the second projecting portion 340 when viewed from the front and back direction is a tapered shape (single taper) in which the width gradually narrows toward the tip. It's becoming
The second projecting portion 340, the restricting portion 313, and the first groove portion 330 are tapered so that the fitting first projecting portion 320 is smoothly guided.

As shown in FIG. 9 , reinforcing ribs 36 are formed on the plate member 31 between the first hook portion 32 and the first hook receiving portion 33 . Specifically, reinforcing ribs 36 are formed along the width direction of the connecting piece 312 on the front side and the back side of the connecting piece 312 of the plate-like member 31 adjacent to the tip side of the second hook bank portion 331. be done.

As shown in FIG. 9A, the reinforcing rib 36 has a ridge shape parallel to the tunnel axis direction, and the shape thereof when viewed from the tunnel axis direction is as shown in FIG. 9B. ) has a trapezoidal shape.
As shown in FIGS. 6 and 7, the reinforcing rib 36 is positioned between the first hook portion 32 and the first hook receiving portion 33 and positioned on the connecting surfaces 20a and 20b to provide a connection between the segments 2. Resists shear forces on surfaces 20a, 20b.

The reinforcing rib 36 forms a pair of second groove portions 350 of the second hook receiving portion 35 on the front surface side and the back surface side together with the opposing bank portion 321 . Since the reinforcing rib 36 is for forming the second groove portion 350, it is also the bank portion of the second hook receiving portion.
The second hook receiving portion 35 is provided on the connecting piece 312 of the plate-like member 31 on the distal end side of the first hook receiving portion 33, and the second projecting portion 340 is fitted into the second groove portion 350 and sandwiched therebetween at the time of connection.
Since the engaging surfaces of the first hook bank portion 321 and the first protruding portion 320 and the second hook bank portion 331 and the second protruding portion 340 are continuously tapered at the time of coupling, smooth mated.

As shown in FIGS. 6 and 7 , one joint fitting 3 a is installed near both ends of the segment 2 in the tunnel axial direction on one connecting surface 20 a of the segment 2 , and the other joint fitting 3 b is installed at the other end of the segment 2 . They are installed near both ends in the tunnel axial direction on the connecting surface 20b.
Concave portions 23a and 23b elongated in the tunnel axial direction are formed in the connection surfaces 20a and 20b at locations where joint fittings are installed.

One joint fitting 3a is provided so that the anchor portion 30 is embedded in the segment 2 together with the base end portion 310, and the tip side of the plate-like member 31 from the restricting portion 313 is exposed from the bottom surface of the recess 23a.
The proximal end side from the reinforcing rib 36 is housed in the recess 23a, and the distal end side from the reinforcing rib 36 protrudes from the recess 23a to the outside.

The plate member 31 is arranged such that the first projecting portion 320, the second projecting portion 340, and the restricting portion 313 project toward the wellhead side. In addition, the plate-like member 31 is arranged on the face side in the recess 23a, and a space is formed on the portal side into which the portion of the plate-like member 31 of the other fitting 3b protruding from the recess 23b can be inserted.

The anchor part 30 of the other fitting 3b is embedded in the segment 2 together with the base end part 310, and the plate-like member 31 is provided so that the tip side from the restricting part 313 is exposed from the bottom surface of the recess 23b.
The proximal end side from the reinforcing rib 36 is housed in the recess 23b, and the distal end side from the reinforcing rib 36 protrudes from the recess 23b to the outside.

The plate member 31 is arranged such that the first projecting portion 320, the second projecting portion 340, and the restricting portion 313 project toward the face side. In addition, the plate-like member 31 is arranged on the port side of the recess 23b, and a space is formed on the face side into which the portion of the plate-like member 31 of one joint fitting 3a protruding from the recess 23a can be inserted.

The plate-like members 31 of one joint fitting 3a and the other joint fitting 3b protrude outward from the opening surfaces of the recesses 23a and 23b, but the connecting surfaces 20a and 20b of the adjacent segments 2 are in contact with each other. In this case, the protruding length is such that the tips do not hit the bottom surfaces of the recesses 23a and 23b facing each other.
Further, when the connecting surface 20a and the connecting surface 20b are brought into contact with each other, the first hook portion 32, the first hook receiving portion 33, the second hook portion 34, and the second hook receiving portion 35 of the one joint fitting 3a They are arranged so as to face the first hook receiving portion 33, the first hook portion 32, the second hook receiving portion 35, and the second hook portion 34 of the other joint fitting 3b.

A method for connecting the segment 2 will be described below.
In order to construct a new segment ring 21 adjacent to the segment ring 21 for which construction has been completed, the segments 2 are sequentially connected in the circumferential direction of the tunnel.

In order to connect the segments 2, as shown in FIG. 13(a), the segment 2A attached prior to the existing segment ring 21 is arranged so as to face the segment 2A with a slight gap in the tunnel circumferential direction. Locate segment 2B.
At this time, the recess 23b formed in the connecting surface 20b of the segment 2A and the recess 23a formed in the connecting surface 20a of the segment 2B substantially face each other.

Next, as shown in FIG. 13(b), the trailing segment 2B is moved in the tunnel circumferential direction to approach the preceding segment 2A, and one of the segments 2B is connected to the other connecting surface 20b of the segment 2A. The surface 20a is brought into contact.

Then, the plate member 31 of one fitting 3a installed on one connecting surface 20a of the segment 2B is inserted into the space of the recess 23b formed on the other connecting surface 20b of the segment 2A, and the segment 2A The plate-like member 31 of another fitting 3b installed on the other connecting surface 20b of the segment 2B is inserted into the space of the recess 23a formed on the one connecting surface 20a of the segment 2B.

Next, as shown in FIG. 13(c), the trailing segment 2B is moved to the portal side in the axial direction of the tunnel, and the first hook portion 32 and the first hook receiver of one joint fitting 3a provided on the segment 2B are moved. The first hook receiving portion 33, the first hook portion 32, and the second hook receiving portion 35 of the other joint fitting 3b provided with the portion 33, the second hook portion 34, and the second hook receiving portion 35 in the preceding segment 2A, The second hooks 34 are engaged with each other, and the first protrusions 320 of the first hooks 32 are fitted into the first grooves 330 on the front side and the back side of the first hook receiving part 33 and sandwiched between them. By fitting and sandwiching the second projecting portion 340 of the second hook portion 34 into the second groove portions 350 on the surface side and the back surface side of the second hook receiving portion 35, one joint fitting 3a of the segment 2B and the other of the segment 2A The joint metal fitting 3b of is connected.

[Other Modifications]
The invention is not limited to the embodiments described above. Examples include:

In this embodiment, the anchor portion is a U-bolt, but it is not limited to this, and for example, it may be a metal fitting provided with fixing bolts on both sides. Also, the mounting structure between the plate-like member and the anchor portion can be appropriately changed depending on the shape of the anchor portion.

In this embodiment, both the first hook portion and the first hook receiving portion, and the second hook portion and the second hook receiving portion are provided and engaged in one joint fitting, but this is not the only option. do not have. Only the first hook portion and the first hook receiving portion may be provided without providing the second hook portion and the second hook receiving portion. In addition, in addition to the first hook portion and first hook receiving portion, and the second hook portion and second hook receiving portion, third or more hook portions and hook receiving portions are provided and engaged in one joint fitting. can be

It is good also as an example by applying each technical matter in any embodiment to other embodiments.

Reference Signs List 1 shield tunnel 2 segment 20 connection surface 20a one connection surface 20b other connection surface 21 segment ring 22 joint between rings 23a, 23b concave portion 3 connection joint 3a one joint metal fitting 3b other joint metal fitting 30 anchor portion 300 male screw portion 301 Nut 31 Plate-like member 310 Base end portion 311 Mounting piece 312 Connection piece 313 Regulating portion 32 First hook portion 320 First projecting portion 321 First hook bank portion 33 First hook receiving portion 330 First groove portion 331 Second hook portion Bank portion 332 Regulator bank portion 34 Second hook portion 340 Second projecting portion 35 Second hook receiving portion 350 Second groove portion 36 Reinforcing rib

Claims (12)

A connecting joint that connects segments by relatively moving one joint fitting and another joint fitting in one direction,
The one joint fitting and the other joint fitting are respectively composed of a plate-shaped member fixed to a segment, a first hook portion provided on the tip side of the plate-shaped member, and the first hook portion of the plate-shaped member. a first hook receiving portion provided on the proximal end side of the hook portion,
The first hook has a pair of first projections projecting in one direction of the plate member,
The first hook receiving portion has a pair of first groove portions on the front surface side and the back surface side of the plate-like member,
A connection joint characterized by connecting by fitting said 1st protrusion part in said 1st groove part, and pinching|interposing. The first protruding portion has a tapered shape in which the width gradually narrows toward the tip, and the first groove portion has a tapered shape in which the width gradually narrows in the direction in which the first protruding portion is fitted. A coupling joint according to claim 1, characterized in that there is a. 3. The coupling joint according to claim 1, wherein the distance between the facing surfaces of the first projecting portion gradually widens toward the tip. The first hook receiving portion has a restricting portion protruding toward one side of the plate-like member on the base end side from the first groove portion of the plate-like member,
4. The restricting portion according to any one of claims 1 to 3, wherein the restricting portion guides the first projecting portion when the first projecting portion is fitted into the first groove portion. articulated joint. 5. A reinforcing rib according to any one of claims 1 to 4, characterized in that a reinforcing rib is formed on said plate member between said first hook portion and said first hook receiving portion. articulated joint. The one joint fitting and the other joint fitting further comprise a second hook provided closer to the base end side than the first hook of the plate-like member, and the first hook of the plate-like member. A second hook receiving portion provided on the tip side from the receiving portion,
The second hook has a pair of second projections projecting in one direction of the plate member,
The second hook receiving portion has a pair of second groove portions on the front surface side and the back surface side of the plate-like member,
6. The connection joint according to any one of claims 1 to 5, wherein the second projection is fitted into and sandwiched between the second grooves for connection. The second protruding portion has a tapered shape in which the width gradually narrows toward the tip, and the second groove portion has a tapered shape in which the width gradually narrows in the direction in which the second protruding portion is fitted. 7. The coupling joint according to claim 6, characterized in that: 8. The coupling joint according to claim 6 or 7, wherein the distance between the facing surfaces of the second projecting portion gradually widens toward the tip. The plate-like member has attachment portions to which anchor portions projecting from both sides in the tunnel axis direction of the plate-like member are attached, and the thickness of the plate-like member between the attachment portions in the segment thickness direction is 9. A coupling joint according to any one of claims 1 to 8, characterized in that it is thinner than the thickness of said mounting portion. 10. The coupling joint according to any one of claims 1 to 9, wherein the one joint fitting and the other joint fitting have the same shape. The plate-like member has an attachment portion to which anchor portions projecting from both sides of the plate-like member in the tunnel axial direction are attached;
An anchor part attached to the attachment part,
11. The anchor part according to any one of claims 1 to 10, wherein the anchor part has a male screw part, and the male screw part is passed through the mounting part and fastened with a nut. articulated joint. 12. The coupling joint according to claim 11, wherein the anchor portion is U-shaped with the male threaded portions at both ends.

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